Peculiar Velocities within R = 6000 km/s

Alan Dressler

Section 4: Summary

Many methods have now confirmed the basic features of the velocity field discovered by the Seven Samurai: signifcant bulk flow over the sphere R < 6000 km/s; a larger amplitude flow in the general direction of the CMB dipole; even larger velocities for the Centaurus clusters. I believe these data and interpretations are robust for the region R < 6000 km/s, though at greater distances systematic errors may be substantially influencing our results. Distances to early-type galaxies dervied using the surface-brightness-fluctuation technique promise to greatly improve our ability to map the dark matter distribution within 3000 km/s and, eventually, with better ground-based observations and the Hubble Space Telescope, to establish a much more reliable picture of flows on the R < 10,000 km/s scale.

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